Speed-indicator for continuous or alternating current motors.



M. O. A. LATOUE.

SPEED INDICATOR FOR CONTINUOUS 0R ALTERNATING CURRENT MOTORS. APPLICATION FVILED $313.23, 1909.

1,1 17,144, I 4 Patented H0110, 3914.

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nienrus C. A. LA'IGUR, OF BPiIKIS, FRANCE, ASSIGNQR 'lO GENERAL ELECTRIC CQMPANY, 1 CORPORATION NEW SPEEIl-INDICATOR F63 C DNTIN'UOUS 0E ALTEENATHEG CURRENT MOTORS.

Specification of Letters Patent.

Patented Nov. 10, 1914. Application filed February 23, 1905. Serial Silo. $29,170.

, the best embodiment thereof but I dot-not To l h i yngyflmwflwi tion may be eu bodied and by means of Be it known that I, Mannie C. A. La'ro'qn, uhgiclrthe1 method 11113} be prafitlsed. tril i tdf $231 53 diliiii iw tn i32 nutrients? i'iltiiol eastern; ful improvements in Speed-Indicators for invention and applied to a series traction Continuous or Alternating Currgnt Motors, motohr; and Fig. slhowsd ahrelay operating h' h the iollowin is a s eci ication. on t e same princip e an aving an armalliy invention read; to s igeei indticators ture responsivetto the speed of an alternatfor electric motors an its 0 cc is 0 proing current mo or. vide a simple and reliable metliod of and ap- In the arrangement shown in Fig. 1,Wh1ch paratus for determining the speed of rotais only a da gralm alpd dois npt attempt to tion of an electric motor. slow any e a1 5 o cons ruc on, a ser1es My invention is based upon the following traction motorhaving an exciting winding principle; if the potential applied to the tera compensat ng winding ?2 and an armaminals of a continuous current motor is destul'e Wlndmg 1S C QCE d n Serles between ignated by V, the resistance of the armature e trolley lpdlcated by g and the ground by R, and the current absorbed in the motor ma d hthe sp c fi f rm f apparaby I, it is possible to derive the equation Bus s n m i d a i gs, a 0011 6 1s energlued by the potential at the terminals of Null B, the motor and gives a flux perpendicular to K0 the flux produced by a coil d, which is connected in series with the motor and therefore in which N deslgnfltes the 11111117931 of is traversed by the current through the motions per second 0t theinoton 1a a constant ton A suitably mounted armature or bar and 0 thg flux 111 lnclusmg m l' of of soft iron, f, takes the direction of the re the motor. In reality, 0 1s a function either sultam field produced by the two coils d n u of the of shunt motors 9r L t e and by its direction measures the speed of the case of series motors. It maybe said the mofior. that N is a function of the two variables V The same apparatus will act on a1ternat and I and 1t is therefore possible to ponce ve ing Current Series or repulsion motors if in of devices Whlch glve the Speed as Iunctlon some suitable way the apparatus is prevent- Of V and of a n ed from becoming the seat of a rotary field In the case 015 a series motor, the nu); 1s a adapted to give the bar. or armature f a certain function of the current 01, and in a movement this case the equablon becomes The arrangement diagrammatically shown' V--IR in Fig. 2 operates on the same principle and m causecs1L the posltlontofflan armaltupe f tcl t be varie in response 0 1e spec 0 an a or- If both the saturation and the resistance hating current motor. The armature f is of the armature are neglected,.the speed is attracted on one hand by the coil e excited evidently proportional to the apparent rcin derivation or shunt to the motor and on sistance of the motor and in carrying out my the other hand by the coil d excited in se-"QB invention, the apparent resistance oi the rice with the motor. Under these conditions motor is measured by any suitable device the action of the coil d predominates at low and thereby an. indication of the speed of speed and the action of the coil 6 predomithe motor dis secured. Var-103s bfolrms flof patesfat speed, copsequzntlytpe 8.121111%- measurm evices may be use u in e ure w1 c angeposl 1011 a a cer am e preferred construction, an apparatus similar nite and predetermined speed ofthe motor. to an ohm meter is employed. d In accordancelulith -tale prgiglswfiis Qf'lZhG M invention will best be understoo in patent statutes ave escri t e rineiconnhction with the accompanying drawing, ple of operatidn of my invention, to gether showing diagrammatically one it .varie with the apparatus which I consider to be one forms of apparatus in whit t e inven- 

